package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Employee;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;
import java.beans.Transient;
import java.util.ArrayList;
import java.util.List;


@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /***
     * 新增菜品和对应的口味
     * @param dishDTO
     */
    @Transactional//设计菜品表和口味表的操作 两表 加上事务注解确保数据一致性
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);//把前面对象的属性拷贝到后面对象 前提是属性名一致

        //向菜品表添加1条数据
        dishMapper.insert(dish);

        Long dishID = dish.getId();//获取insert语句生成的主键值 下面口味表插入时 知道往哪个菜品插入

        //向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors(); //取出口味的集合
        if(flavors !=null && flavors.size() >0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishID);
            });
            dishFlavorMapper.insertBatch(flavors);//批量插入
        }
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page=dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 删除菜品
     * @param ids
     * @return
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否包含正在起售中的？ 是->不能删除
        for (Long id : ids) {
            Dish dish=dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                //如果dish的状态== 1 处于起售状态 不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断当前是否被套餐关联？ 是->不能删除 how? 根据中间表（setmeal_dish）判断当前菜品id是否能查到对应的套餐id
        List<Long> setMealIds = setmealDishMapper.getMealIdsByDishIds(ids);
        if(setMealIds !=null &&setMealIds.size() >0 ){
            //当前是被套餐关联了 不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //可以删除 删除菜品表中的菜品数据

//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            //接上面 删除菜品关联的口味数据
//            dishFlavorMapper.deleteByDishId(id);
//
//        }
        //有优化的空间 因为这个foreach会向数据库发送  ids.size（） 条sql语句 若是只发送一条 则效率会提高很多
        //如 delete from ... where id in(?,?,?)

        //根据菜品id集合批量删除菜品
        //delete from ... where id in(?,?,?)
        dishMapper.deleteByIds(ids);

        //根据菜品id集合批量删除关联的口味数据
        //delete from ... where id in(?,?,?)
        dishFlavorMapper.deleteByDishIds(ids);

    }

    /**
     * 根据id查询菜品及其对应的口味
     * @param id
     * @return
     */
    public DishVO getByIdWithFlavor(Long id) {
        //1.先查询dish 2.再查询对应的口味 3.最后将两部分封装一起dishvo

        //根据id查询对应的Dish
        Dish dish = dishMapper.getById(id);

        //根据id查询对应的口味数据
        List<DishFlavor> dishFlavors=dishFlavorMapper.getByDishId(id);

        //封装到VO对象里
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 修改菜品基本信息及其口味信息
     * @param dishDTO
     * @return
     */
    public void updateWithFlavor(DishDTO dishDTO) {
        //菜品直接修改 update语句即可
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.update(dish);

        //口味则是 增 删 改 都有可能 逻辑较为复杂。可以->将之前的口味全都删掉 然后将新传过来的口味在添加上去
        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //插入新的口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();

        if(flavors !=null && flavors.size() >0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);//批量插入
        }
    }

    /**
     * 起售停售菜品
     * @param id
     * @param status
     * @return
     */
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        if (status == StatusConstant.DISABLE) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            // select setmeal_id from setmeal_dish where dish_id in (?,?,?)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if (setmealIds != null && setmealIds.size() > 0) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }


    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
